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who wants to use digital download to make his own assault weapons. >> science fiction has become reality. all it takes is some liquid plastic and a state of the art 3 the printer to produce the parts needed to make an assault rifle -- stated the art -- state-of- the-art 3-d printer. the internet provided the templates needed. his idea of a free society is one where everyone can make their own weapons. >> we have seen this shooting. this shooting will probably end with the sandy hook shooting. the shooting will probably end with legislation banning this type of firearm, right? this file will still be on line. you see what i'm saying? it will still be able to reproduce. if you cannot buy it in store, look how much this project is important. >> the shafts needs time to dry. we will visit again tomorrow when cody will show us how to shoot with it, but for now, it is off to latexes gun show -- a texas gun show. gun sales spike in the wake of mass shootings. people want to show what they have and stock up on the latest gear. organizers did not allow us to film inside. >> evil does not
100 or more people here at our peak times. most of the science is done during summer. that's when the animals are here. that's when the day is longest. so there's more opportunity to work. >> reporter: the experts are trying to understand the impact of climate change by examining links between ice volume and wildlife. this unmanned apparatus can check the condition of underwater ice. it can precisely measure thickness and record changes in volume. scientists also use krill as a sort of canary in the coalmine. the small crustaceans live below the ice, and they are a key food source for marine animals. but estimates suggest their population is in decline. antarctic division in tasmania breeds krill in antarctic conditions. researchers officially change the environment to monitor the impact on crustaceans. they are trying to find out if the thinning of the ice could affect krill numbers. bigger animals at the south pole provide even more data. scientists in the university of tasmania have attached small devices on elephant seals to record their movements and the temperature of the se
people can't see the dot on the horizon that you see? >> we associate utopia with science fiction showing those visions gone wrong. we associate utopia with how we perceive communism, especially soviet communism. because utopia has been so discredited, so dragged through the mud politically, especially during the years of the cold war, that anyone who speaks in that language is dismissed in one form or another. >> would you call frederick douglas utopian? barack obama utopian? >> frederick douglas, i imagine, was like the other abolitioni s abolitionists, regarded as dabbling in dreams. and would have been dismissed as a dreamer, or worse, a fraud. because when his first autobiography came out, when the narrative came out, many people questioned whether he had written it himself. it was impossible that a slave could have written these words. it must have been one of his abolitionist friends, one of his white abolitionist friends. it must have been garrison, et cetera. well, it turns out that, indeed, douglas wrote those words. >> do you feel the same way four years later about that momen
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